Extruder screens play a crucial role in blown film production by removing contaminants, such as gels, contaminants, and impurities from the melt before it enters the die and is blown into a film. These screens are typically made of stainless steel and are designed to withstand high temperatures and pressures. Here’s an overview of extruder screens for blown film production:
Types of extruder screens: There are several types of extruder screens used in blown film production, including:
Circular screens: These screens are round in shape and are placed at the end of the extruder barrel, right before the melt enters the die. They are commonly used to prevent larger contaminants from reaching the die and affecting the quality of the film.
Mesh screens: Mesh screens are composed of a fine mesh of stainless steel wires mesh. They are designed to filter out smaller particles and gels that may be present in the melt. Mesh screens are available in various mesh sizes, allowing for different levels of filtration.
Selecting the appropriate mesh size: The choice of mesh size depends on the specific requirements of your blown film production. The mesh size determines the level of filtration and the size of particles that will be captured by the screen. Finer mesh sizes are used for higher filtration efficiency, but they may require more frequent cleaning or replacement.
